US Treasury Average Interest Rates — official Fiscal Data API, no login

**Average interest rates on us treasury securities** — Monthly average interest rates on U.S. Treasury securities (22 types) via the Treasury's official Fiscal Data API. Every monthly rate on record. No login, gov data.

Monthly average interest rates on U.S. Treasury securities — Bills, Notes, Bonds, TIPS, Floating Rate Notes, savings securities, and more (22 security types) — pulled from the official U.S. Department of the Treasury, Bureau of the Fiscal Service public Fiscal Data REST API (api.fiscaldata.treasury.gov). No account, no API key, no proxies.

The Fiscal Data license page states it plainly: "The data is offered free, without restriction, and available to copy, adapt, redistribute, or otherwise use for non-commercial or commercial purposes."

Tested (2026-09-02)

Security type	Records returned	Notes
Treasury Bills	307 total on file	monthly
Treasury Inflation-Protected Securities (TIPS)	262 total on file	parentheses in the name work fine
Nonexistent security type	0	empty result, no error

Average interest rates on us treasury securities — input

{
  "targets": ["Treasury Bills", "Treasury Notes"],
  "maxItems": 2000
}

Each target is a security type exactly as Treasury lists it (e.g. Treasury Bills, Treasury Notes, Treasury Bonds, Treasury Inflation-Protected Securities (TIPS), Treasury Floating Rate Notes (FRN), Government Account Series, Total Marketable, Total Non-marketable). A security type with no matching records simply returns 0 items for that target (no charge).

Average interest rates on us treasury securities — output fields

One dataset item per monthly rate record:

Field
security_type_desc / security_desc	marketable vs. non-marketable, and the specific instrument
avg_interest_rate_amt	the official average interest rate for that month (percentage)
record_date	the reporting date
record_fiscal_year / record_fiscal_quarter	U.S. federal fiscal period
record_calendar_year / record_calendar_quarter / record_calendar_month / record_calendar_day	calendar period breakdown
src_line_nbr	Treasury's own source line number for the record

No personal data: these are government accounting statistics by security type, not individual transactions or people.

Why this over Treasury's own website

fiscaldata.treasury.gov's UI is built for browsing one dataset at a time. This actor runs a batch of security types in one call and hands back structured rows — for building rate-history trackers, fixed-income research pipelines, or datasets that need this as data, not a web page.

Use Cases

• Rate-history tracking — build a monthly time series of average interest rates by security type
• Fixed-income benchmarking — compare average rates across security types over time
• Government accounting reference — pull official average rates by fiscal period for reporting
• Economic trend analysis — correlate average Treasury rates with other macro indicators

Pricing

Pay per event: $1.00 per 1,000 interest-rate records collected. Nothing else.